Display data transfer control apparatus applicable for display u

Details Display data transfer control apparatus applicable for display u Display data transfer control apparatus applicable for display u

1986-11-07

1989-07-18

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340730, 340731, G09G 114

Patent

active

048497479

ABSTRACT:
Disclosed is a display data transfer control apparatus in which a line control memory which can preset raster count data for modifying, in units of lines, an address of a main storage storing a character font to be displayed and character attribute data are provided, and a transfer line in the character font is determined for each line transfer in a DMA transfer sequence, so that, e.g., multi font control, character vertical elongation control, and ruled line vertical extension control, as well as processing character attributes such as an underline and overline, can be realized in the DMA transfer sequence.

REFERENCES:
patent: 3868673 (1975-02-01), Mau, Jr. et al.
patent: 4283724 (1981-08-01), Edwards
patent: 4291305 (1981-09-01), Kimura et al.
patent: 4405830 (1983-09-01), Foster et al.
patent: 4439761 (1984-03-01), Fleming et al.
patent: 4481578 (1984-11-01), Hughes et al.

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